the boy is old enough to get dressed

选C.get dressed.
get dressed 表示打扮自己,给自己穿衣,带上合适的穿着.
A wear clothes 仅仅表示穿上衣服
B coats 表示外套
D dress 后面通常不加 衣服.
dress 作为及物动词时可以用为 dress oneself

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